/* * Driver for * Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable * System Managers with Nonvolatile Fault Registers * Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers * with Nonvolatile Fault Registers * Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System * Monitors with Nonvolatile Fault Registers * * Copyright (C) 2011 Ericsson AB. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/jiffies.h> enum chips { max16065, max16066, max16067, max16068, max16070, max16071 }; /* * Registers */ #define MAX16065_ADC(x) ((x) * 2) #define MAX16065_CURR_SENSE 0x18 #define MAX16065_CSP_ADC 0x19 #define MAX16065_FAULT(x) (0x1b + (x)) #define MAX16065_SCALE(x) (0x43 + (x)) #define MAX16065_CURR_CONTROL 0x47 #define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /* * l: limit * 0: min/max * 1: crit * 2: lcrit * x: ADC index */ #define MAX16065_SW_ENABLE 0x73 #define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV warning */ #define MAX16065_CURR_ENABLE (1 << 0) #define MAX16065_NUM_LIMIT 3 #define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */ static const int max16065_num_adc[] = { [max16065] = 12, [max16066] = 8, [max16067] = 6, [max16068] = 6, [max16070] = 12, [max16071] = 8, }; static const bool max16065_have_secondary[] = { [max16065] = true, [max16066] = true, [max16067] = false, [max16068] = false, [max16070] = true, [max16071] = true, }; static const bool max16065_have_current[] = { [max16065] = true, [max16066] = true, [max16067] = false, [max16068] = false, [max16070] = true, [max16071] = true, }; struct max16065_data { enum chips type; struct i2c_client *client; const struct attribute_group *groups[4]; struct mutex update_lock; bool valid; unsigned long last_updated; /* in jiffies */ int num_adc; bool have_current; int curr_gain; /* limits are in mV */ int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC]; int range[MAX16065_NUM_ADC + 1];/* voltage range */ int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */ int curr_sense; int fault[2]; }; static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 }; static const int max16065_csp_adc_range[] = { 7000, 14000 }; /* ADC registers have 10 bit resolution. */ static inline int ADC_TO_MV(int adc, int range) { return (adc * range) / 1024; } /* * Limit registers have 8 bit resolution and match upper 8 bits of ADC * registers. */ static inline int LIMIT_TO_MV(int limit, int range) { return limit * range / 256; } static inline int MV_TO_LIMIT(int mv, int range) { return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255); } static inline int ADC_TO_CURR(int adc, int gain) { return adc * 1400000 / (gain * 255); } /* * max16065_read_adc() * * Read 16 bit value from <reg>, <reg+1>. * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>. */ static int max16065_read_adc(struct i2c_client *client, int reg) { int rv; rv = i2c_smbus_read_word_swapped(client, reg); if (unlikely(rv < 0)) return rv; return rv >> 6; } static struct max16065_data *max16065_update_device(struct device *dev) { struct max16065_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { int i; for (i = 0; i < data->num_adc; i++) data->adc[i] = max16065_read_adc(client, MAX16065_ADC(i)); if (data->have_current) { data->adc[MAX16065_NUM_ADC] = max16065_read_adc(client, MAX16065_CSP_ADC); data->curr_sense = i2c_smbus_read_byte_data(client, MAX16065_CURR_SENSE); } for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++) data->fault[i] = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i)); data->last_updated = jiffies; data->valid = 1; } mutex_unlock(&data->update_lock); return data; } static ssize_t max16065_show_alarm(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); struct max16065_data *data = max16065_update_device(dev); int val = data->fault[attr2->nr]; if (val < 0) return val; val &= (1 << attr2->index); if (val) i2c_smbus_write_byte_data(data->client, MAX16065_FAULT(attr2->nr), val); return snprintf(buf, PAGE_SIZE, "%d\n", !!val); } static ssize_t max16065_show_input(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct max16065_data *data = max16065_update_device(dev); int adc = data->adc[attr->index]; if (unlikely(adc < 0)) return adc; return snprintf(buf, PAGE_SIZE, "%d\n", ADC_TO_MV(adc, data->range[attr->index])); } static ssize_t max16065_show_current(struct device *dev, struct device_attribute *da, char *buf) { struct max16065_data *data = max16065_update_device(dev); if (unlikely(data->curr_sense < 0)) return data->curr_sense; return snprintf(buf, PAGE_SIZE, "%d\n", ADC_TO_CURR(data->curr_sense, data->curr_gain)); } static ssize_t max16065_set_limit(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); struct max16065_data *data = dev_get_drvdata(dev); unsigned long val; int err; int limit; err = kstrtoul(buf, 10, &val); if (unlikely(err < 0)) return err; limit = MV_TO_LIMIT(val, data->range[attr2->index]); mutex_lock(&data->update_lock); data->limit[attr2->nr][attr2->index] = LIMIT_TO_MV(limit, data->range[attr2->index]); i2c_smbus_write_byte_data(data->client, MAX16065_LIMIT(attr2->nr, attr2->index), limit); mutex_unlock(&data->update_lock); return count; } static ssize_t max16065_show_limit(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); struct max16065_data *data = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%d\n", data->limit[attr2->nr][attr2->index]); } /* Construct a sensor_device_attribute structure for each register */ /* Input voltages */ static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0); static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1); static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2); static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3); static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4); static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5); static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6); static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7); static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8); static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9); static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10); static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11); static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12); /* Input voltages lcrit */ static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 0); static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 1); static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 2); static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 3); static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 4); static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 5); static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 6); static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 7); static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 8); static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 9); static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 10); static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 2, 11); /* Input voltages crit */ static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 0); static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 1); static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 2); static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 3); static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 4); static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 5); static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 6); static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 7); static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 8); static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 9); static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 10); static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 1, 11); /* Input voltages min */ static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 0); static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 1); static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 2); static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 3); static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 4); static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 5); static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 6); static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 7); static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 8); static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 9); static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 10); static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 11); /* Input voltages max */ static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 0); static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 1); static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 2); static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 3); static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 4); static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 5); static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 6); static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 7); static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 8); static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 9); static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 10); static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit, max16065_set_limit, 0, 11); /* alarms */ static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 0); static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 1); static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 2); static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 3); static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 4); static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 5); static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 6); static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL, 0, 7); static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL, 1, 0); static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL, 1, 1); static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL, 1, 2); static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL, 1, 3); /* Current and alarm */ static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0); static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL, 1, 4); /* * Finally, construct an array of pointers to members of the above objects, * as required for sysfs_create_group() */ static struct attribute *max16065_basic_attributes[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in0_lcrit.dev_attr.attr, &sensor_dev_attr_in0_crit.dev_attr.attr, &sensor_dev_attr_in0_alarm.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in1_lcrit.dev_attr.attr, &sensor_dev_attr_in1_crit.dev_attr.attr, &sensor_dev_attr_in1_alarm.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in2_lcrit.dev_attr.attr, &sensor_dev_attr_in2_crit.dev_attr.attr, &sensor_dev_attr_in2_alarm.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in3_lcrit.dev_attr.attr, &sensor_dev_attr_in3_crit.dev_attr.attr, &sensor_dev_attr_in3_alarm.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in4_lcrit.dev_attr.attr, &sensor_dev_attr_in4_crit.dev_attr.attr, &sensor_dev_attr_in4_alarm.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in5_lcrit.dev_attr.attr, &sensor_dev_attr_in5_crit.dev_attr.attr, &sensor_dev_attr_in5_alarm.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, &sensor_dev_attr_in6_lcrit.dev_attr.attr, &sensor_dev_attr_in6_crit.dev_attr.attr, &sensor_dev_attr_in6_alarm.dev_attr.attr, &sensor_dev_attr_in7_input.dev_attr.attr, &sensor_dev_attr_in7_lcrit.dev_attr.attr, &sensor_dev_attr_in7_crit.dev_attr.attr, &sensor_dev_attr_in7_alarm.dev_attr.attr, &sensor_dev_attr_in8_input.dev_attr.attr, &sensor_dev_attr_in8_lcrit.dev_attr.attr, &sensor_dev_attr_in8_crit.dev_attr.attr, &sensor_dev_attr_in8_alarm.dev_attr.attr, &sensor_dev_attr_in9_input.dev_attr.attr, &sensor_dev_attr_in9_lcrit.dev_attr.attr, &sensor_dev_attr_in9_crit.dev_attr.attr, &sensor_dev_attr_in9_alarm.dev_attr.attr, &sensor_dev_attr_in10_input.dev_attr.attr, &sensor_dev_attr_in10_lcrit.dev_attr.attr, &sensor_dev_attr_in10_crit.dev_attr.attr, &sensor_dev_attr_in10_alarm.dev_attr.attr, &sensor_dev_attr_in11_input.dev_attr.attr, &sensor_dev_attr_in11_lcrit.dev_attr.attr, &sensor_dev_attr_in11_crit.dev_attr.attr, &sensor_dev_attr_in11_alarm.dev_attr.attr, NULL }; static struct attribute *max16065_current_attributes[] = { &sensor_dev_attr_in12_input.dev_attr.attr, &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_curr1_alarm.dev_attr.attr, NULL }; static struct attribute *max16065_min_attributes[] = { &sensor_dev_attr_in0_min.dev_attr.attr, &sensor_dev_attr_in1_min.dev_attr.attr, &sensor_dev_attr_in2_min.dev_attr.attr, &sensor_dev_attr_in3_min.dev_attr.attr, &sensor_dev_attr_in4_min.dev_attr.attr, &sensor_dev_attr_in5_min.dev_attr.attr, &sensor_dev_attr_in6_min.dev_attr.attr, &sensor_dev_attr_in7_min.dev_attr.attr, &sensor_dev_attr_in8_min.dev_attr.attr, &sensor_dev_attr_in9_min.dev_attr.attr, &sensor_dev_attr_in10_min.dev_attr.attr, &sensor_dev_attr_in11_min.dev_attr.attr, NULL }; static struct attribute *max16065_max_attributes[] = { &sensor_dev_attr_in0_max.dev_attr.attr, &sensor_dev_attr_in1_max.dev_attr.attr, &sensor_dev_attr_in2_max.dev_attr.attr, &sensor_dev_attr_in3_max.dev_attr.attr, &sensor_dev_attr_in4_max.dev_attr.attr, &sensor_dev_attr_in5_max.dev_attr.attr, &sensor_dev_attr_in6_max.dev_attr.attr, &sensor_dev_attr_in7_max.dev_attr.attr, &sensor_dev_attr_in8_max.dev_attr.attr, &sensor_dev_attr_in9_max.dev_attr.attr, &sensor_dev_attr_in10_max.dev_attr.attr, &sensor_dev_attr_in11_max.dev_attr.attr, NULL }; static umode_t max16065_basic_is_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); struct max16065_data *data = dev_get_drvdata(dev); int index = n / 4; if (index >= data->num_adc || !data->range[index]) return 0; return a->mode; } static umode_t max16065_secondary_is_visible(struct kobject *kobj, struct attribute *a, int index) { struct device *dev = container_of(kobj, struct device, kobj); struct max16065_data *data = dev_get_drvdata(dev); if (index >= data->num_adc) return 0; return a->mode; } static const struct attribute_group max16065_basic_group = { .attrs = max16065_basic_attributes, .is_visible = max16065_basic_is_visible, }; static const struct attribute_group max16065_current_group = { .attrs = max16065_current_attributes, }; static const struct attribute_group max16065_min_group = { .attrs = max16065_min_attributes, .is_visible = max16065_secondary_is_visible, }; static const struct attribute_group max16065_max_group = { .attrs = max16065_max_attributes, .is_visible = max16065_secondary_is_visible, }; static int max16065_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = client->adapter; struct max16065_data *data; struct device *dev = &client->dev; struct device *hwmon_dev; int i, j, val; bool have_secondary; /* true if chip has secondary limits */ bool secondary_is_max = false; /* secondary limits reflect max */ int groups = 0; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_READ_WORD_DATA)) return -ENODEV; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (unlikely(!data)) return -ENOMEM; data->client = client; mutex_init(&data->update_lock); data->num_adc = max16065_num_adc[id->driver_data]; data->have_current = max16065_have_current[id->driver_data]; have_secondary = max16065_have_secondary[id->driver_data]; if (have_secondary) { val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE); if (unlikely(val < 0)) return val; secondary_is_max = val & MAX16065_WARNING_OV; } /* Read scale registers, convert to range */ for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) { val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i)); if (unlikely(val < 0)) return val; for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) { data->range[i * 4 + j] = max16065_adc_range[(val >> (j * 2)) & 0x3]; } } /* Read limits */ for (i = 0; i < MAX16065_NUM_LIMIT; i++) { if (i == 0 && !have_secondary) continue; for (j = 0; j < data->num_adc; j++) { val = i2c_smbus_read_byte_data(client, MAX16065_LIMIT(i, j)); if (unlikely(val < 0)) return val; data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]); } } /* sysfs hooks */ data->groups[groups++] = &max16065_basic_group; if (have_secondary) data->groups[groups++] = secondary_is_max ? &max16065_max_group : &max16065_min_group; if (data->have_current) { val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL); if (unlikely(val < 0)) return val; if (val & MAX16065_CURR_ENABLE) { /* * Current gain is 6, 12, 24, 48 based on values in * bit 2,3. */ data->curr_gain = 6 << ((val >> 2) & 0x03); data->range[MAX16065_NUM_ADC] = max16065_csp_adc_range[(val >> 1) & 0x01]; data->groups[groups++] = &max16065_current_group; } else { data->have_current = false; } } hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, data->groups); if (unlikely(IS_ERR(hwmon_dev))) return PTR_ERR(hwmon_dev); return 0; } static const struct i2c_device_id max16065_id[] = { { "max16065", max16065 }, { "max16066", max16066 }, { "max16067", max16067 }, { "max16068", max16068 }, { "max16070", max16070 }, { "max16071", max16071 }, { } }; MODULE_DEVICE_TABLE(i2c, max16065_id); /* This is the driver that will be inserted */ static struct i2c_driver max16065_driver = { .driver = { .name = "max16065", }, .probe = max16065_probe, .id_table = max16065_id, }; module_i2c_driver(max16065_driver); MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); MODULE_DESCRIPTION("MAX16065 driver"); MODULE_LICENSE("GPL");